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keliling = 36
4 ( sisi ) = 36
4 ( 2x + 3 ) = 36
8x + 12 = 36
8x = 36 - 12
8x = 24
x =
x = 3
Nomor 2
2 ( panjang + lebar ) = 80
2( 5a + 4a ) = 80
2 ( 9a ) = 80
28a = 80
a =
a = 2,85
sehingga panjangnya
5a = 5 x 2,85
= 14,25